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Vulnerabilities CVE-2026-4769

CVE-2026-4769

Critical
Open
TLP:CLEAR

Unauthenticated Access to Internal Diagnostic Interface

NVD CVE.org
Critical Infrastructure

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Description

Certain devices in the WAGO System I/O Field series activate an internal diagnostic capability during the initial startup sequence. This functionality is not formally documented and becomes accessible without authentication for a brief period in the early boot phase. During this window, an unauthenticated remote attacker can gain access to the internal system processes, resulting in full system compromise.

Details

CVSS Score
9.3
EPSS Score
0.45%

37.2th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 13, 2026
Last Modified
Jul 13, 2026
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